How big do you print?

Hi,
I'm planning to print large from 6x6 pinhole negatives (almost certainly using a scanner and digital printing on silver gelatin paper). How large would you go? I'm guessing that the lack of sharpness in the image will mean that I can go much larger than with a lensed image as the softness can't get any more pronounced ('worse'?). I'm thinking 20"x20" to start with...
Thanks, Mark